EP 0790516 A1 19970820 - Image display apparatus
Title (en)
Image display apparatus
Title (de)
Bildanzeigegerät
Title (fr)
Appareil d'affichage d'images
Publication
Application
Priority
JP 2513896 A 19960213
Abstract (en)
An image display apparatus which enables observation of a clear image at a wide field angle with substantially no reduction in the brightness of the observation image, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be fatigued. The image display apparatus includes an image display device and an ocular optical system for projecting an image formed by the image display device and for leading the projected image to an observer's eyeball. The ocular optical system (3) has three surfaces, and a space formed by the three surfaces is filled with a medium having a refractive index larger than 1. The three surfaces include, in the order in which light rays pass in backward ray tracing from the observer's eyeball (1) to the image display device (4), a first surface (5) which functions as both a refracting surface and an internally reflecting surface, a second surface (6) which is a reflecting surface facing the first surface (5) and decentered or tilted with respect to an observer's visual axis (2), and a third surface (7) which is a refracting surface closest to the image display device (4), so that reflection takes place three times in the path from the observer's eyeball (1) to the image display device (4). <IMAGE>
IPC 1-7
IPC 8 full level
H04N 5/64 (2006.01); G02B 27/01 (2006.01); G02B 27/02 (2006.01); G02B 27/00 (2006.01)
CPC (source: EP US)
G02B 27/0101 (2013.01 - EP US); G02B 27/0172 (2013.01 - EP US); G02B 2027/011 (2013.01 - EP US); G02B 2027/0118 (2013.01 - EP US); G02B 2027/0125 (2013.01 - EP US); G02B 2027/0132 (2013.01 - EP US); G02B 2027/0178 (2013.01 - EP US)
Citation (search report)
- [X] EP 0365406 A1 19900425 - THOMSON CSF [FR]
- [A] EP 0583116 A2 19940216 - MARCONI GEC LTD [GB]
- [A] EP 0408344 A2 19910116 - MARCONI GEC LTD [GB] & JP H03101709 A 19910426 - MARCONI GEC LTD
- [A] EP 0460983 A1 19911211 - THOMSON CSF [FR]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0790516 A1 19970820; EP 0790516 B1 20010905; DE 69614993 D1 20011011; DE 69614993 T2 20020110; JP H09219832 A 19970819; US 5699194 A 19971216; US RE37579 E 20020312
DOCDB simple family (application)
EP 96105372 A 19960403; DE 69614993 T 19960403; JP 2513896 A 19960213; US 38338299 A 19990826; US 60588696 A 19960223